of: Add vendor prefix for Cirrus Logic

This patch adds a device tree vendor prefix for Cirrus Logic, Inc.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 902b1b1..723bd8d 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -14,6 +14,7 @@
 brcm	Broadcom Corporation
 cavium	Cavium, Inc.
 chrp	Common Hardware Reference Platform
+cirrus	Cirrus Logic, Inc.
 cortina	Cortina Systems, Inc.
 dallas	Maxim Integrated Products (formerly Dallas Semiconductor)
 denx	Denx Software Engineering